H. Wu, M. Zubair, и K. Maly. HYPERTEXT '06: Proceedings of the seventeenth conference on Hypertext and hypermedia, стр. 111--114. New York, NY, USA, ACM Press, (2006)
S. Xu, S. Bao, B. Fei, Z. Su, и Y. Yu. Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, стр. 155--162. New York, NY, USA, ACM, (2008)
M. Szomszor, I. Cantador, и H. Alani. Proceedings of the 19th ACM Conference on Hypertext and Hypermedia (Hypertext 2008), стр. 33--42. New York, NY, USA, ACM, (июня 2008)